2006
DOI: 10.1016/j.jssc.2005.11.030
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The transformation of ferrihydrite into goethite or hematite, revisited

Abstract: During the oxidation of iron, poorly crystallized phases are firstly formed: 2 line-ferrihydrite and 6-line ferrihydrite, which present for the last phase, a similarity with wustite FeO but also with hematite o-FezO3. Crystallization increases with time and the solid phase obtained is dependent on temperature and pH. Obviously, high temperature favours the formation of the oxide hematite cr-FezO:. As for the pH factor, it is more complicated. Low and high values of pH (2 to 5 and 10 to14) favour the formation … Show more

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Cited by 305 publications
(222 citation statements)
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“…Generally, the magnetic properties of materials have been dependent on factors, such as the morphology and crystal structure (including impurities or substitutions) of the samples (Cudennec and Lecerf 2006;Subarna et al 2007). As the size of the hematite particle decreases to the micro/ nanometer scale, materials can exhibit unusual magnetic behaviors that are quite different from those of conventional bulk materials (Sorescu et al 1999).…”
Section: Magnetic Studiesmentioning
confidence: 99%
“…Generally, the magnetic properties of materials have been dependent on factors, such as the morphology and crystal structure (including impurities or substitutions) of the samples (Cudennec and Lecerf 2006;Subarna et al 2007). As the size of the hematite particle decreases to the micro/ nanometer scale, materials can exhibit unusual magnetic behaviors that are quite different from those of conventional bulk materials (Sorescu et al 1999).…”
Section: Magnetic Studiesmentioning
confidence: 99%
“…Other elements can be adsorbed from solution onto ferrihydrite [41,42]. Ferrihydrite is a poorly crystalline compound that in solution pH 2-5, transforms to goethite (reaction (3)) [43,44].…”
Section: Mineral Dissolution In Acidic Environmentsmentioning
confidence: 99%
“…Goethite (Fe III OOH): Formation is favoured from solutions of pH > 4 with low sulfate concentrations [43,45].…”
Section: Mineral Dissolution In Acidic Environmentsmentioning
confidence: 99%
“…3 En los pigmentos compuestos por óxidos férricos, el ion Fe 3+ es el cromóforo que le imparte el color rojo al material. En la mayoría de los compuestos a los que, en general, nos referimos como óxidos férricos (en realidad, óxidos, hidróxidos u oxihidróxidos férricos), la unidad estructural básica está constituida por un octaedro con un ion Fe 3+ central en coordinación seis con oxígenos (O 2-), oxidrilos (OH -) y/o agua (H 2 O) ( Jang et al 2007) formando un empaquetamiento con significante grado de enlaces covalentes Fe-O (Cornell & Schwertmann 1996;Cudennec & Lecerf 2006) (fig. 5a).…”
Section: Los Pigmentos Rojizos Naturalesunclassified
“…A su vez, los minerales que contienen cromóforos en la estructura cristalina son cromógenos y generan color (Wenk & Bulakh 2004). 4 Los oxihidróxidos de hierro, ocasionalmente, están formados por un tetraedro con el catión férrico rodeado por oxígenos u oxidrilos, con fuertes uniones covalentes (Fe-O) que originan un empaquetamiento casi hexagonal, levemente distorsionado (Cornell & Schwertmann 1996;Cudennec & Lecerf 2006). 5 En la estructura cristalina de los filosilicatos intervienen diferentes tipos de uniones químicas entre las hojas y entre las láminas: a) uniones catión-anión (intermedias entre uniones iónicas y covalentes) entre los átomos que forman las hojas de tetraedros y octaedros (Meunier 2005) y b) uniones intermoleculares de intercapa por la acción de fuerzas de Van der Waals (enlaces muy débiles) que promueven el espacio interlaminar y las uniones puente de hidrógeno (débiles) entre los cationes hidratados de intercapa y las capas tetraédricas.…”
Section: Notasunclassified